This case has been extensively studied both experimentally [1]} as well as theoretically [2]}, [3]}, [4]}.
The moiré pattern in this case is a triangular lattice with fundamental matrix (REF )
\(A_\mathcal {M} = \frac{1}{2 \sin (\theta /2)} J\, A \qquad \text{where} \quad J = R_{-\pi /2}=\begin{bmatrix} 0 & 1 \\ -1 & 0 \end{bmatrix},\) 
